9+3x+2x=24

Решение:

1. \[ 9 + 3x + 2x = 24 \]
2. \[ 9 + 5x = 24 \]
3. \[ 5x = 24 - 9 \]
4. \[ 5x = 15 \]
5. \[ x = \frac{15}{5} \]
6. \[ x = 3 \]

Ответ: 3